Contributing: Added steps to install rust and cargo (#16)

* `Contributing`: Added steps to install `rust` and `cargo`

* Minor edits to installation docs

---------

Co-authored-by: Andrew Tavis McAllister <andrew.t.mcallister@gmail.com>

CONTRIBUTING.md

@@ -77,23 +77,46 @@ git remote add upstream https://github.com/scribe-org/Scribe-Desktop.git
   - `origin` (forked repository)
   - `upstream` (Scribe-Desktop repository)
 
-2. (Optional) Install [pre-commit](https://pre-commit.com/) and its hooks to check for and correct common errors in commits:
+2. Install Rust and Cargo:
+
+- For Linux and macOS:
+
+Run the following command in your terminal:
+
+```bash
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+```
+
+Follow the on-screen instructions to complete the installation. You can find more details in the [official Rust documentation](https://doc.rust-lang.org/book/ch01-01-installation.html).
+
+- For Windows:
+
+Download and run [rustup-init.exe](https://rustup.rs/). Follow the instructions in the installer. For more details, visit the [Rust Windows installation guide](https://www.rust-lang.org/tools/install).
+
+After installation, you may need to restart your terminal for the changes to take effect. Verify the installation by running:
+
+```bash
+rustc --version
+cargo --version
+```
+
+3. (Suggested) Install [pre-commit](https://pre-commit.com/) and its hooks to check for and correct common errors in commits:
 
 ```bash
 pip install pre-commit
 pre-commit install
 # pre-commit run --all-files
 ```
 
-3. Run the following to spin up a local copy of the Scribe-Desktop GUI:
+4. Run the following to spin up a local copy of the Scribe-Desktop GUI:
 
 ```bash
 cd scribe
 cargo build
 cargo run --bin scribe
 ```
 
-4. You may need to give your terminal or IDE permission for your keyboard strokes to be read
+5. You may need to give your terminal or IDE permission for your keyboard strokes to be read
    - You may also need to restart the application and then run `cargo run --bin scribe` again
 
 > [!NOTE]